My video card is a GTX 1070. Average rendering time per image is 2 hours. And I need to create scenes, dream up, find interesting angles, then prepare animations and render it all. And I'm not DS, I don't do 4-5 frames per scene, I prefer more images if it's not just dialogue. After that it still takes time to add the scene in game, codding, codding. Everything takes time.
That's if I had a second computer, then yes, that could speed up the work by about 1/3. I create a scene, drop it on the second comp, the scene renders and the main comp is available and do the rest of the scene.
And as I wrote above, a whole month went to waste as I didn't get a single cent for the work done. And now there's an opportunity to get donations, so I'm just now starting work on the update.